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          <h1 class="post-title" itemprop="name headline">前端性能优化常用技术手段--JavaScript 面向切面编程(AOP)入门</h1>
        

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        <h1 id="面向切面编程的概念解读"><a href="#面向切面编程的概念解读" class="headerlink" title="面向切面编程的概念解读"></a>面向切面编程的概念解读</h1><h2 id="什么是面向切面编程？"><a href="#什么是面向切面编程？" class="headerlink" title="什么是面向切面编程？"></a>什么是面向切面编程？</h2><blockquote>
<p>Aspect Oriented Programming (AOP)，面向切面编程，是一个比较热门的话题。AOP主要实现的目的是针对业务处理过程中的切面进行提取，它所面对的是处理过程中的某个步骤或阶段，以获得逻辑过程中各部分之间低耦合性的隔离效果。– 面向切面编程_百度百科</p>
</blockquote>
<h2 id="用普通的大白话去解释上面比较官方的话"><a href="#用普通的大白话去解释上面比较官方的话" class="headerlink" title="用普通的大白话去解释上面比较官方的话"></a>用普通的大白话去解释上面比较官方的话</h2><ul>
<li><p>什么是切面</p>
<blockquote>
<p>比如说我们用刀切一块面包，那么切过之后在我们眼前的这个面就是所谓的切面</p>
</blockquote>
</li>
<li><p>面向切面比较热门是因为它有很多的优点，因为它可以进行那种无侵入的干扰</p>
<blockquote>
<p>比如说还是我们有一块面包，切得时候不乱切，从他的开头或者结尾的地方进行切取，而不是从中间横切竖切，如果我们按照这种顺序来切就始终能保留着它有一块完整的面包，如果说乱切又横切又竖切这样的话这块面包就乱掉了，所以面向切面编程最大的优点就是它可以对业务进行无侵入的干扰</p>
</blockquote>
</li>
<li><p>“AOP 主要的目的是针对业务处理过程中的切面进行提取”</p>
<blockquote>
<p>这句话就是说：你想要吃面包就从两头切就好了，而不要从中间乱动</p>
</blockquote>
</li>
<li><p>“它所面对的是处理过程中的某个步骤或阶段”</p>
<blockquote>
<p>这句话是说：他所面对的肯定是我们当前需要处理的业务中的某个部分， 要对这个业务进行一系列的操作，以及对这个业务进行相应的提取和隔离，我们不对人家具体的业务进行干扰，我们只对这个业务进行操作，将这个业务放到开头或者结尾表面的位置</p>
</blockquote>
</li>
<li><p>“以获得逻辑过程中各部分之间低耦合性的隔离效果”</p>
<blockquote>
<p>这句话是说：如果你往人家的业务里面穿插了一些代码，比如说比较常用的例子：要做一个网页的性能检测，那么就要在我们的 html 代码里面穿插各种各样比较讨厌的节点，然后再加很多东西，或者说你用 js 来做，在 js 中埋下 N 多的埋点，然后再恰当的时机再 send 给服务器，如果说你把这个做成面向切面的话，就是不在里面进行埋点，而是在整体的业务逻辑上给它加对应的东西，然后这个东西在需要执行的函数之前或者之后执行，这样的话如果有一天进行了热插拔，将真正的函数给抽走了，那么这样对原来人家的逻辑也不会有任何的影响，那么你这个埋点的工作就和人家原来的执行函数没有任何相应的混淆，他也能进行这种隔离效果</p>
</blockquote>
</li>
</ul>
<h2 id="用图片来解释上面的逻辑"><a href="#用图片来解释上面的逻辑" class="headerlink" title="用图片来解释上面的逻辑"></a>用图片来解释上面的逻辑</h2><p><img src="/blog/2018/09/23/前端性能优化常用技术手段-JavaScript-面向切面编程-AOP-入门/前端性能优化常用技术手段-TypeScript-面向切面编程-AOP-入门/timg.jpg" alt="image.png"></p>
<blockquote>
<p>上图的是一个地板，这个地板对向我们的这个面就是我们用刀把地板横割出来的一个面，那么如果说我们想测这个地板的高度和宽度的话，我们是不需要在它的里面打一个一个的小点然后一点点的那么去测的，我们最常用的方法肯定是：上下表面在上表面用米尺往下一钩、压紧了，然后一看显示的就是这个的高了，同样的道理在横向的方向这样一压尺子也就能知道这个的宽了，这个就是通过他的上下面、左右面就能拿到对应的想要拿到的数据了，这个例子就是所谓的面向切面编程了</p>
</blockquote>
<h1 id="JavaScript-面向切面编程的代码实战"><a href="#JavaScript-面向切面编程的代码实战" class="headerlink" title="JavaScript 面向切面编程的代码实战"></a>JavaScript 面向切面编程的代码实战</h1><figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">function</span> <span class="title">test</span>(<span class="params"></span>) </span>&#123;</span><br><span class="line">    alert(<span class="number">2</span>);</span><br><span class="line">    <span class="keyword">return</span> <span class="string">'me test'</span>;</span><br><span class="line">&#125;;</span><br><span class="line"></span><br><span class="line"><span class="built_in">Function</span>.prototype.before = <span class="function"><span class="keyword">function</span>(<span class="params">fn</span>)</span>&#123;</span><br><span class="line">    <span class="keyword">var</span> __self = <span class="keyword">this</span>;</span><br><span class="line">   </span><br><span class="line">   <span class="keyword">return</span> <span class="function"><span class="keyword">function</span>(<span class="params"></span>)</span>&#123;</span><br><span class="line">       <span class="keyword">if</span>(fn.apply(<span class="keyword">this</span>,<span class="built_in">arguments</span>) == <span class="literal">false</span>)&#123; </span><br><span class="line">           <span class="keyword">return</span> <span class="literal">false</span>;</span><br><span class="line">       &#125;</span><br><span class="line"></span><br><span class="line">       <span class="keyword">return</span> __self.apply(__self, <span class="built_in">arguments</span>); </span><br><span class="line">      &#125;</span><br><span class="line"></span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="built_in">Function</span>.prototype.after = <span class="function"><span class="keyword">function</span>(<span class="params">fn</span>)</span>&#123;</span><br><span class="line">    <span class="keyword">var</span> __self = <span class="keyword">this</span>;</span><br><span class="line">    <span class="keyword">return</span> <span class="function"><span class="keyword">function</span>(<span class="params"></span>)</span>&#123;</span><br><span class="line">        <span class="keyword">var</span> result = __self.apply(__self,<span class="built_in">arguments</span>);</span><br><span class="line">        <span class="keyword">if</span>(result == <span class="literal">false</span>)&#123;</span><br><span class="line">            <span class="keyword">return</span> <span class="literal">false</span>;</span><br><span class="line">        &#125;</span><br><span class="line"></span><br><span class="line">        fn.apply(<span class="keyword">this</span>,<span class="built_in">arguments</span>);</span><br><span class="line"></span><br><span class="line">        <span class="keyword">return</span> result;</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br><span class="line">test.after(<span class="function"><span class="keyword">function</span>(<span class="params"></span>)</span>&#123;</span><br><span class="line">    alert(<span class="number">3</span>);</span><br><span class="line">&#125;).before(<span class="function"><span class="keyword">function</span>(<span class="params"></span>)</span>&#123;</span><br><span class="line">    alert(<span class="number">1</span>);</span><br><span class="line">&#125;)();</span><br></pre></td></tr></table></figure>
<h1 id="要理解AOP编程就必须理解apply"><a href="#要理解AOP编程就必须理解apply" class="headerlink" title="要理解AOP编程就必须理解apply"></a>要理解AOP编程就必须理解apply</h1><p>总结一句话：apply() 就是用来让括号里的对象 来集成括号外的函数的属性！可以称之为继承！</p>

      
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